I have had a-fib for over a year. I had cardioversion which worked for 4 weeks. I was put on fleckanide. I developed severe shaking where I couldn't button a shirt, write, or pick up a cup without spilling. Beside the shakilg my hands would jerk when I reached for something often knocking several things to the floor. When on the PC my mouse jerks all over the place. Both my cardiologist and family doctor thought it was a reaction to fleckanide and took me off. The symptoms have decreased somewhat but are now permanent.